a change in which the atoms rearrange and form a new substance - Chemical change, What word is used in chemical equations instead of "equal" / = - "Yields" or "Reacts to form....", substances present at the beginning of a chemical change - Reactants, substance that is formed during a chemical change - product, Forming a gas or bubbles, forming a precipitate, changing colors and a change in temperature - Four indicators of a chemical reaction, A change in which just the appearance of a substance changes (no new substance is formed) - Physical change, When energy is released during a chemical reaction (the products end up with less energy than the reactants) - Exothermic reaction, Matter can never be created nor destroyed - it simply is constantly changing into different forms - Law of Conservation of Matter and Energy, A way to show a chemical reaction using chemical formulas and numbers - Chemical equation, The minimum amount of energy needed to start a chemical reaction - Activation energy, Reactant + Reactant yields a __________ - Product, When energy is absorbed during a chemical reaction (the products end up with more energy than the reactants) - Endothermic reaction, Synthesis, Decomposition, Single Replacement, Double Replacement - Four types of chemical reactions, Amount of surface area, concentration, temperature, catalysts & inhibitors - Five things that affect the RATE of a chemical reaction, A substance that speeds up a chemical reaction by LOWERING the activation energy needed - Catalyst, A solid that forms from liquids during a chemical reaction - Precipitate, A BIOLOGICAL catalyst that helps to speed up chemical reactions - Enzyme, Does increasing the concentration of a substance usually speed up or slow down a chemical reaction? - Speeds Up, Does lowering the temperature usually speed up or slow down a chemical reaction? - Slows Down, The small number that tell how many specific atoms there are in a compound or molecule - Subscript, A substance that slows down or stops a chemical reaction - Inhibitor, Does increasing the surface area of the reactant usually speeds up or slows down a chemical reaction? - Speeds Up, In the chemical formula 3H2SO4, what is the "3" called?? - Coefficient,

Chemical Reactions

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